Brake and clutch



Aug. 5, 1952 H. H. TALBOYS ETAI.

BRAKE AND CLUTCH Filed Jan. 3. 1949 Hen/y yf. 'yalboy fe/mer l. Kraft umWN oN am Wm.. E QW NN QN Patented Aug. 5, 1952 BRAKE AND CLUTCH Henry H;Taiboys, Milwaukee, Wis., and Selmer A. Kraft, SitPaul, Minn.,assignorsto Johnson ower-'On-Tran'smission Corporation, Chicago,

Ill., a corporation of Illinois Application January 3, 1949, Serial63,014 l Our invention relates to an improvement in `brake and clutchwherein it is desired to proembodying expandable and contractabletubes.l

In most instances these tubes form a driving connection between arotatable member anda brake or vclutch shoe. The present invention dealswitha type of brake and clutch in which Ythe brake and clutch shoes'arefixed relativeto one of the elements and is merely moved radially by theexpandable member.

` An object of the present invention lies in the provision of a brakeand clutch which will op-` erate effectively in either direction. .Thebrake and clutch shoes of our device are provided with interlockingmeans which limit the rotative movement of the shoe relative to thesupporting member. As a result one end of the shoe is held fixed fromrotation upon contact with a relatively rotatable element, while theother end of the shoe is free to press against the relatively rotatableelement. In the other direction of rotation the opposite end of thebrake shoe becomes dead ended to its supporting member and the first endof the brakev shoe is free to engage 6 Claims. (Cl. 18S-152) therelatively rotatable element. As a result an eiiicient braking system isprovided with a maximum of simplicity.

A feature of the present invention lies in the provision of a brake andclutch including a brake shoe, a brake shoe support, a relativelyrotatable member, and an expandable and ccntractable member for urgingthe brake shoe against the 'forth in the following specication andclaims.

In the drawings forming a part of our specification:

Figure 1 is an elevational view partly in section showing our brake andclutch construction.

Figure 2 is a sectional view on the line 2-2 of Figure 1.

Figure 3 is a-detail view of a type of spring which may be used with thebrake and clutch.

For the purpose of convenience the brake and clutch will be described asa clutch in the followy ing description. Obviously by holding one of therotatable elements from rotation the device can comprise a brake. l n

The clutch A includes a hub I9 having a radially extending circularflange Il secured thereto. A substantially cylindrical drum I2 isprovided with a ring shaped flange I3 thereupon which may be bolted orotherwise secured to the flange I I by means of bolts I4. The hub ID maybe keyed to a rotatable shaft or sleeve ormay be held from rotationdepending upon the use to which the clutch is being put.

A second hub I5 supports a peripheral ilange I6. A cylindrical outershell Il is provided with a peripheral flange I3 bolted or otherwiseaflixed to the flange I6 by bolts 20. The shell I1 is provided with twoparallel inwardly extending iianges 2| and 22. These flanges encirclethe drum I2 and lie in closely spaced relation thereto.

A pair of hollow arcuate expandable and contractable tubes 23 and 24 aresupported in opposed relation against the inner surface of the shell l1between the flanges 2I and 22. These tubes 23 and 24 are held in placeby four angularly spaced lugs or abutments 25, 26, 2l, and 29. Theseabutments are secured to the outer shell I 'I or are integral therewithand define the length of Vspace in which the tubes 23 and 24 arelocated.

; Radially extending tubular connections 3l) and 3! communicate with theinterior of the tubes 23 and 24 respectively. These tubular connections39 and 3| communicate with axially extending tubular members 32 and 33which are bent to form radially extending tubes 34 and I35 extending-into a groove 36 in the hub I 5. By forcing iiuid into the groove36,1this fluid may be communicated into the tubular members 23 and 24 toexpand thel same. The relation of fluid pressure permits a reverse flowof fluid and consequent contraction oi` the tubular elements.

A pair of brake shoes 31 and 39 are mounted inwardly of the expandableand contractable members 23 and 24. The'brake shoe 3l is provided with apair of radially extending lugs or abutments 40 and 4I at its oppositeends. The

' lugs.

sleeve. wardlyfrom the hub'53. A :generally cylindrical brake shoe 39 issimilarly provided with a pair of radially extending abutments 42 and 43at its kopposite ends. These abutments are designed to engage theabutments 25, 26, 2'I and 29 on the outer shell I1.

A brake lining 44 is secured by rivets 45 or other suitable #means tothe `.braise shoe 31. A similarlbrake lining46 is riveted or otherwisesecured to the brake shoe 3S. Thus when the brake shoe is urged inwardlyby expansion of the tubular elements 23 and 24, the brake linings 44 and46 engage frictionally against the `exterior surface of the drum I2.

The operation of the clutch thusrormed is relatively simple. Whenitispdesired 'togprevent relative rotation between the hub 36 and thehub I0, fluid pressure is introduced .into the tubular elements 23 and24, tendingto'expandthe same. Expansion of these tubularelements'moves-'the brake shoes 31 and 39'inwardly and urges the bra-ke`linings A4A and S againstthe drum -A I 2 If the drum I2 is moving in aclockwise direction asviewedin.Figurerl.relative to the shelllII,,-the.frictional engagement .between Vthe `liningpf the draws Uthe `lug 43yagainst `the abutment `2i-,and

wraps the rend ofthe-shoesupporting theV1ug-42 about the drum I2.-Obviously-the lugs-4I and 42 tend to pull away from their ,respectivefixed ,abutments and 2'?.

-Llpon operation of the clutch YAwhen-the'drum f I2 v-is vrotated fin facounter-clockwise direction relative tothe-shell -I`I ,the lug 4I ,ofthebrake sshoe 3-'I'will fbe drawn ftightly against the abutment.25, whilethe endOf theshoe supporting the lug ,-Ill will wrap-about the drum I2..Similarly .the -lug `-42 -land -brake shoe f39 vwill be drawn againstthe abutment 261and the rend ofv the shoe ,supporting the lug A13 willvwrapabout the drum I2, :tending to -pull 'away-,from the xed'abutmentThis wrapping-action of the brakeshoes about thedrurn-I'Z produces aneffectivebraking action betweentheshell lI'Iand the drum I2.

A #spring il isfinserte'd between thelugsvl and-43 ofithebrake'shoes-:SIfand "39 respectively,

and a similar spring 41iisfinterposedibetweengthe lugs'i rand-42 ofthese samebralrefshoe's. The

-springs 141 vare l:expansiontypesprings-:shaped to `urge' the:connectedflugsapartoragainst theixed abutments. This #thus expands they*brake shoes .and holds them-:out of .contactvwiththe brake -which yarev"bent :to "form spaced "loops 50. lThe loops '0v 'terminate inoutwardly directly opposed ends 5I which'engage in suitable sockets V'orapertures such Aas "52 "in the various 'The springs are preferablyslightly in compression fwhen in'place and movement of the lugs in Ea`direction yto contract -thebrake -shoes acts to y'further compress'thesprings lII.

A secondclutch or brake member is also incorp'oratedi'n the clutchandbrake A. A hub`53 is provided for engagement on arsuitable shaft or A`disc Yshaped fange v54 extends voutring5 5V is -supported'concentrictofand spaced in- Vwardlv'.fromttlfie drum I2. This ring yor sleeve 55is provided with an inwardly extending integral flange 56 which overlapswith and is bolted to the flange 54 by bolts 5'I or other suitablemeans. The sleeve 55 is provided with a pair of diametrically opposedoutwardly projecting fixed abutments 59 and 60. These abutmentsextend-radiallyto a point slightlyspaced from the inner surface ofthedrum I 2. Apair of arcuated brake shoes 6I and 62 are providedoutwardly of the sleeve 55. The brake shoe 6I is provided with a pair ofinwardly extending lugs 63 and `64 at its opposite ends which areengageable against-the xed abutments 59 and 60. The `brake shoe62 issimilarly equipped with a pair of V4lugs I5.;and-It lwhich are mountedon the ends of the .shoe vand which are designed to engage against thefixedabutments 59 and 60. Brake lining material provides frictionsurfaces 61 and 69 onthe brake shoes 6I and 52, the brake liningmaterial being riveted or otherwise secured to the brake-shoes.

YAn varcuated hollow -expandableand rcontractable tubular elementv isvprovided inwardly loi? each brake shoe, the brake shoe `el beingprovided with a tubular memberi, whilethe brake shoe .62 is .providedwith an-expandable tubular element y'II. Hollow stems 'I2 -an'd 'I3vcommunicate With-the interior ofv the Atubular members 'I0 and -'I-I soas to-deliverffluid underpressure thereto. -When- -uid under pressure isexerted through the stems 'I2 and V'I3 the brake shoes are expandedagainst thebrake drum I2 tending-to prevent relative-.rotation betweenthese members.

As indicated in Figure 2 of the drawings the abutments VV59 and vIii!,are provided with l notches 'i4 thereinand the various lugs are-alsocentrally recessed as indicated at T5. 11A-spring x16 is pin connectedto the lug l53 and to the lug-V65 .tendwill be urgedagainst 'theabutments 59 and and the otherv ends of theseishoes v.will'be free/ttowrap against vthe 'inner Asurface vof 'the drum. Thusthe ffrontiend ofthe brake shoe isin each case dead ended, while the rear end is free 'topressagainst lthezdrum. A similar arrangement is provided when thedrum-I2 is operatingin .a counter-clockwise direction. 'The lug ends 65Vand s4 lpressiagainst the abutments 59 and '60 respectively and -form adead end for the forward ends rof the brake shoes, allowing the rear endto freely'urge against the drum.

' In'accordance with the patent statuteswe have .described the:principles of construction and operation of our brake andfclutch, and-while we have endeavored `to set 'forth the 'best embodivment "thereof,vwe desire to have it understood that obvious changes may be made withinthe scope of the following claims `without departing from the spirit ofour invention.

We claim:

1. A friction device including a `pair lofconcentric drums, meanssupporting said drums for relative rotation, a pair of fixed abutmentson the outermost drum extending inwardly therefrom, a brake shoe betweensaid drums and extending vbetween said xed abutments and the inner drum,means on the ends of said brake shoe engageable with said fixedabutments outwardly of said fixedl abutments, and expandable andcontractable means between said brake shoe and the outermost drum.

2. A friction device including a pair of spaced concentric drums, a pairof opposed brake shoes between said drums and engageable with the innerof said drums, a pair of abutments for each brake shoe on the outerdrum, said brake shoes extending beyond said abutments, lugs on the endsof said brake shoes beyond said abutments engageable with said fixedabutments and eX- pandable and contractable members between each brakeshoe and the outer drum.

3. rIhe structure described in claim 2 and including spring means forurging said lugs against said abutments. Y

4. The structure described in claim 2 and including spring means forurging the ends of said brake shoes apart.

5. The structure described in claim 2 in which the expandable andcontraotable elements comprise hollow tubular elements between saidfixed abutments.

6. A friction device including a pair of concentric relatively rotatableelements, an inner generally cylindrical surface on the outer element, apair of fixed lugs extending inwardly from the cylindrical surface ofthe outermost of said rotatable elements, a brake shoe between saidrotatable elements and extending beyond and inwardly of said lugs,outwardly extending lugs on the ends of said brake shoe extending beyondsaid iixed lugs engageable against said fixed lugs and forming thedriving connection therebetween, and an expandable and contractableelement between said brake shoe and the outer of said rotatableelements.

HENRY H. TALBOYS.

SELMER A. KRAFT.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,047,713 Smith Dec. 17, 19121,707,272 Livingston 1- Apr. 2, 1929 1,954,158 Ward Apr. 10, 19342,249,405 Thompson July 15, 1941 2,257,771 Williamson Oct. 7, 1941FOREIGN PATENTS Number Country w Date 593,078 Great Britain Oct. 8, 1947

